Electron-phonon coupling in metallic and plastically deformed strontium titanate

ORAL

Abstract

A significant enhancement of the bulk superconducting transition temperature was recently discovered in electron-doped SrTiO3 single crystals subjected to plastic deformation [1]. Here we present the results of a titanium L-edge resonant inelastic x-ray scattering study of plastically deformed and undeformed electron-doped SrTiO3. No change in electronic coupling to longitudinal optical (LO) phonon modes is observed between deformed and undeformed samples, which places new constraints on the nature of the previously observed Tc enhancement. Furthermore, our measurements of samples with different charge-carrier concentrations enable us to obtain new insight into the role of electronic coupling to LO phonon modes in the superconducting pairing mechanism of electron-doped SrTiO3.

[1] S. Hameed et al., Nat. Mater. 21, 54 (2022)

*Work supported by the Croatian Science Foundation under UIP-2020-02-9494 and by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC0016371.

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Presenters

  • Luka Rogic

    • University of Zagreb

Authors

  • Luka Rogic

    • University of Zagreb

  • Sajna Hameed

    • Max Planck Institute for Solid State Research

  • Issam Khayr

    • University of Minnesota, Twin Cities
    • University of Minnesota

  • Mirian Garcia-Fernandez

    • Diamond Light Source

  • Damjan Pelc

    • University of Zagreb

  • Martin Greven

    • University of Minnesota

  • Matteo Minola

    • Max Planck Institute for Solid State Research

  • Bernhard Keimer

    • Max Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research